On 2:59 PM, Richard D. Moores wrote:
It's great to have you chime in, Steven. I do wish you would stop
pulling your punches, however. ;)
On Fri, Oct 22, 2010 at 17:23, Steven D'Aprano<st...@pearwood.info> wrote:
On Sat, 23 Oct 2010 12:42:50 am Richard D. Moores wrote:
So I wrote a function:
def float2n_decimals(floatt, n):
"""
Given a float (floatt), return floatt to n decimal places.
E.g., with n =, 81.34567 -> 81.35
"""
return ("%%.%sf" % n) % floatt
which works fine,
float2n_decimals(x, 3)
is better written in place as:
"%.*f" % (3, x)
There's no need for a function for something so simple.
Yes, but I needed one for ("%%.%sf" % n) % floatt .
<snip>
Sometimes Steven's style can be a bit caustic, but there's almost always
a few important nuggets. In this case, you missed the one that your
formatting is unnecessarily complicated, at least if you have a recent
enough Python version.
In particular,
"%.*f" % (n, myfloat)
will convert myfloat to a string, and use n as the precision, just as
your more complex expression. The asterisk is the magic character, that
says use n as the precision field.
This syntax was available at least in 2.3, so unless you need to use an
older version, there's not much need for the two-stage template system.
DaveA
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
